Sketch the regions bounded by the graphs of the following functions and then compute their areas using integrals, after figuring out which slicing is the most appropriate (vertical or horizontal). (a) y = x2 4x 5, y = 0 (b) x = 8y y2, x = 0 (c) y = x2 2x, y = x2 (d) x = y2 2y, x y 4 = 0